Multidimensional measurements of beam single-spin asymmetries in semi-inclusive deep-inelastic charged-kaon electroproduction off protons in the valence region

Multidimensional measurements of beam single-spin asymmetries in semi-inclusive deep-inelastic charged-kaon electroproduction off protons in the valence region The American Physical Society (APS) 11/01/2025 10690213 10.1103/2m4z-htrp Physical Review C 2469-9985 112 5 A KripkoS DiehlK JooP AchenbachJ S AlvaradoM AmaryanW R ArmstrongH AtacH AvakianL BaashenN A BaltzellL BarionM BashkanovF BenmokhtarA BianconiA S BiselliM BondiF BossùS BoiarinovK-T BrinkmannW J BriscoeW K BrooksT CaoR CapobiancoD S CarmanJ C CarvajalA CelentanoP ChatagnonG CiulloP L ColeM ContalbrigoV CredeA D'AngeloN DashyanR De_VitaM DefurneA DeurC DilksC DjalaliR DupreH EgiyanA El_AlaouiL El_FassiL ElouadrhiriS FeganI P FernandoA FilippiG GavalianG P GilfoyleD I GlazierR W GotheY GotraK HafidiH HakobyanM HattawyF HauensteinT B HaywardD HeddleA HobartM HoltropY IlievaD G IrelandE L IsupovH JiangH S JoT KageyaA KimW KimV KlimenkoV KubarovskyS E KuhnL LanzaP LenisaX LiZ LuI_J D MacGregorD MarchandD MartiryanV MascagnaD MatamorosM MaynesB McKinnonR G MilnerT MineevaM MirazitaV MokeevC Munoz_CamachoP Nadel-TuronskiT NagornaK NeupaneD NguyenS NiccolaiG NiculescuM OsipenkoM OuillonP PandeyL L PappalardoR ParemuzyanE PasyukS J PaulN PilleuxS Polcher_RafaelJ PoudelJ W PriceY ProkT ReedM RipaniJ RitmanC D RobertsP RossiA A RusovaS SchadmandA SchmidtY G SharabianE V ShirokovS ShresthaU ShresthaD SokhanN SparverisM SpreaficoI I StrakovskyS StrauchR TysonM UngaroS VallarinoL VenturelliT VittoriniH VoskanyanA VossenE VoutierY WangD P WattsU WeerasingheX WeiM H WoodL XuS-S XuN ZachariouV ZieglerM ZurekCLAS_Collaboration Measurements of beam single-spin asymmetries in semi-inclusive deep-inelastic electron scattering (SIDIS) with positively charged kaons off protons have been performed with 10.6 and 10.2 GeV incident electron beams using the CLAS12 spectrometer at Jefferson Lab. We report an analysis of the electroproduction of positively charged kaons over a large kinematic range of fractional energy, Bjorken

x

, transverse momentum, and photon virtualities

Q^{2}

ranging from 1

{GeV}^{2}

up to 6

{GeV}^{2}

. This is the first published multidimensionally binned CLAS12 measurement of a kaon SIDIS single-spin asymmetry in the valence quark regime. The data provide constraints on the structure function ratio

F_{L U}^{sin ϕ} / F_{U U}

, where

F_{L U}^{sin ϕ}

is a quantity with a leading twist of twist-3 that can reveal novel aspects of the quark-gluon correlations within the nucleon. The impact of the data on understanding the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing twist-3 parton-distribution functions (PDFs) and fragmentation functions (FFs).

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